What are the details of any aircraft that the SA Airways (SAA) has disposed of and/or returned to owners since 1 September 2021, in terms of the (a)(i) description, (ii) type and (iii) registration number of each aircraft, (b) costs incurred in preparing each aircraft for disposal and/or return to owners, (c) dates each aircraft was disposed of and/or returned to owners, (d) reasons for the disposal and/or return to owners of each aircraft and (e) income received by SAA for each aircraft?